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Retirement Plans And Other Postretirement Benefits (Schedule Of Percentage Composition Of Assets Held By Pension Plans) (Details)
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]      
% Composition of Plan Assets at December 31, Total for continuing operations 100.00% 100.00% 100.00%
Fixed income securities      
Defined Benefit Plan Disclosure [Line Items]      
% Composition of Plan Assets at December 31, Total for continuing operations 7.70% 8.00% 12.80%
Large/mid-capitalization equity securities      
Defined Benefit Plan Disclosure [Line Items]      
% Composition of Plan Assets at December 31, Total for continuing operations 19.00% 14.70% 13.80%
Small-capitalization equity securities      
Defined Benefit Plan Disclosure [Line Items]      
% Composition of Plan Assets at December 31, Total for continuing operations 6.40% 5.30% 4.00%
International and emerging market equity securities      
Defined Benefit Plan Disclosure [Line Items]      
% Composition of Plan Assets at December 31, Total for continuing operations 15.10% 11.50% 10.90%
Total equity securities      
Defined Benefit Plan Disclosure [Line Items]      
% Composition of Plan Assets at December 31, Total for continuing operations 40.50% 31.50% 28.70%
Private equity and hedge funds      
Defined Benefit Plan Disclosure [Line Items]      
% Composition of Plan Assets at December 31, Total for continuing operations 44.60% 48.40% 52.40%
Other assets      
Defined Benefit Plan Disclosure [Line Items]      
% Composition of Plan Assets at December 31, Total for continuing operations 7.20% 12.10% 6.10%